I have deformed the lip on commercial bands and even commercials with post war T3 bands to tighten things up. Just lightly bend the top lip edge inward to make better contact with the nose of the hand guard similar to what one might do with the rear tab and it’s not noticeable.
NO….I would not suggest that on a rare or original band, only for shooters. You can’t very well make dead wood grow and I never have been fond of gluing anything on a gun. But, various solutions are available.